Checklist
of Ventura County Rare Plants[1]
By David L. Magney
California Native Plant Society, Channel Islands Chapter
Updated 28 October 2004
Ventura County is located in southern California, USA, along the east edge of the Pacific Ocean. The coastal portion occurs along the south and southwestern quarter of the County. Ventura County is bounded by Santa Barbara County on the west, Kern County on the north, Los Angeles County on the east, and the Pacific Ocean generally on the south (Figure 1, General Location Map of Ventura County).
Ventura County extends north to 34.9014ºN latitude at the northwest corner of the County. The County extends westward at Rincon Creek to 119.47991ºW longitude, and eastward to 118.63233ºW longitude at the west end of the San Fernando Valley just north of Chatsworth Reservoir. The mainland portion of the County reaches southward to 34.04567ºN latitude between Solromar and Sequit Point west of Malibu. When including Anacapa and San Nicolas Islands, the southernmost extent of the County occurs at 33.21ºN latitude and the westernmost extent at 119.58ºW longitude, on the south side and west sides of San Nicolas Island, respectively.
Ventura County occupies 480,996 hectares [ha] (1,188,562 acres [ac]) or 4,810 square kilometers [sq. km] (1,857 sq. miles [mi]), which includes Anacapa and San Nicolas Islands. The mainland portion of the county is 474,852 ha (1,173,380 ac), or 4,748 sq. km (1,833 sq. mi.) in area and ranges in elevation from sea level on the southwest to 2,692 meters [m] (8,831 feet [ft.]) above sea level at its northern border on Mount Piños (Figure 2, Shade Relief Map of Mainland Ventura County). There appears to be some discrepancy in the actual area covered by Ventura County, depending on the source. For example, according to the California County Fact Book, 1983 edition (California Supervisors Association of California 1983), Ventura County occupies an area of 482,668 ha (1,192,680 ac) or 2,999 sq. km (1,863.6 sq. mi), with 3,254 ha (8,040 ac) or 20.3 sq. km (12.6 sq. mi) of that as water. The discrepancy appears to be a little over 2,469 ha (6,100 ac), which does not correspond to the area occupied by the two islands within the County. However, thhe difference does appears to match the area occupied by a rectangular portion of the county in the northeast corner, where the Ventura County Board of Supervisors voted to give away approximately 6,100 acres to Kern County to accommodate a proposed development that Ventura County felt it could not provide adequate County services to.
Mainland Ventura County is located between 34º00' and 35º00'N latitude and 118º38' and 119º28'W longitude, excluding Anacapa and San Nicolas Islands, and is generally longer than wide. Anacapa Islands are the smallest and easternmost of the northern Channel Islands while San Nicolas Island is an outer southern Channel Island.
Figure 1. General Location Map of Ventura County
Figure 2. Shade Relief Map of Mainland Ventura County
The flora of Ventura County is comprised of over 2,100 (2,119) native and naturalized vascular plant taxa, including those expected to occur but for which no vouchers are known. A total of 1,897 taxa are known to occur in the County and are supported by voucher specimens. Approximately 1,521 taxa (71.8%) are natives, and another 376 nonnative taxa (80.2%) known to occur in the County. A small percentage of the flora species are quite common. Many more of the plants are uncommon to quite rare. All the species (including varieties and subspecies, which are lower taxonomic units than full species) of native and naturalized plants are an important component of the biodiversity of life in Ventura County. While most species do not recognize political boundaries, such as county boundaries, our government agencies set policies and manage land use and resources based on such jurisdictional boundaries.
This list represents a compilation of known records and observations (many by the author) of all native vascular plant species:
· With ten (10) or fewer populations within Ventura County;
· Listed by CNPS on a statewide basis (CNPS 2001);
· Listed by the US Fish and Wildlife Service as Threatened or Endangered under the federal Endangered Species Act;
· Listed by the California Fish and Game Commission as Rare, Threatened, or Endangered;
· Are at the limits of their distribution range (southernmost, northernmost, westernmost extent); or
· The Type Locality occurs within the County (then only the Type Locality is considered sensitive).
Some taxa are considered rare or uncommon throughout California, as established by the California Native Plant Society (CNPS) in it’s Inventory of Rare and Endangered Plants of California, sixth edition[2], even though more than ten populations are known from Ventura County, including Anacapa Islands and San Nicolas Island. Currently there are 1,187 taxa (56%) included on this list of locally rare plants, and include taxa on the mainland and islands. Another 215 (10.1%) were added that are likely to occur in the County but for which no voucher specimens or reliable locality data are available. These are included at the end of this list. Many of these potential additions are known to occur in adjacent counties and expected to occur in Ventura County. A total of 23 plants (1.1%) considered rare in Ventura County occur only on the Channel Islands (Anacapa and San Nicolas Islands) portion of the county. A number of taxa were deleted from this list when over ten occurrences were known to occur in Ventura County.
This list was compiled as the results of extensive research of the flora of Ventura County. It is based on extensive field searches; examination of specimens collected by others housed at public herbaria; and published reports. The author began research on the Ventura County flora in the late 1970s.
Soon to be published separately, Ventura County Rare Plants will provide much more information about those plants included in this checklist, including: a brief description of the plant, habitat preferences, associated plant communities, elevation range, and blooming period. That publication will include additional information for each taxon, including complete scientific name, known synonyms, common name(s), habit and size, rarity status, months it is in bloom or identifiable, and general and specific locality data, with supporting voucher collection information. Each specimen cited for a specific location includes the name of the collector, the collection number (or collection date if no number was assigned), and the herbarium in which it is stored (some duplicate specimens have been deposited in more than one herbarium). Location information is provided at two levels: a general geographic area, and then specific locations.
This list should be considered the best available information at the time of publication, as our knowledge of the Ventura County flora is dynamic, and growing with each botanical survey or foray. This checklist will be updated periodically and revised according to all new verifiable information provided. Occurrences of vascular plants found in Ventura County that add to or could change the status of any plant listed here should be submitted to the author via CNPS (attention: David Magney) or via email to . Any lists submitted must be supported by voucher specimens that are deposited in a public herbarium, according to CNPS and California Botanical Society policies based on Ferren et al. (1995[3]).
Plants not included in CNPS’s Inventory, or listed by federal and state agencies, that have more than ten populations in Ventura County will be dropped from this list, except for those plants:
· representing range limits, such as the westernmost limit of the taxons range; or
· the “Type Locality” sites (“Type Locality” sites are the sites from which the plant was originally collected and formally described from, and is represented by a “Type Specimen”, for which a note occurs after the herbarium at which it is deposited as “Holotype” or “Isotype”).
For those plants that are otherwise relatively common in Ventura County, only the populations that represent the limit of a plants range should be considered of concern (as sensitive), with the remaining population(s) noted to provide perspective, but not considered sensitive/rare for the purposes of this checklist. Artemisia tridentata var. tridentata is an example of this, where it should be considered of local concern when it occurs in the western portion of the Santa Clara River Valley (the limit of its range) while the populations in the Upper Sespe Creek watershed and the northern part of the county are not of concern from a rarity perspective.
Special-status species are plants that are either listed as endangered or threatened under the Federal or California Endangered Special Acts; or considered to be rare under the California Native Plant Protection Act; or considered to be rare (but not formally listed) by resource agencies, professional organizations (e.g. California Native Plant Society), and the scientific community. For the purposes of this checklist, special-status species are further defined in Table 1, Definitions of Special-Status Plant Species.
Listed species are those taxa that are formally listed as endangered or threatened by the federal government (e.g. U.S. Fish and Wildlife Service [USFWS]) pursuant to the national Endangered Species Act or as endangered, threatened, or rare (for plants only) by the State of California (i.e. California Fish and Game Commission) pursuant to the California Endangered Species Act or the California Native Plant Protection Act.
The CNDDB Element Ranking system provides a numeric global and state ranking system for all special-status plant and wildlife species and rare habitats tracked by the CNDDB. The global rank (G-rank) is a reflection of the overall condition of an element (species or natural community) throughout its global range. The state ranking (S-rank) is assigned much the same way as the global rank, except state ranks in California often also contain a threat designation attached to the S-rank. This Element Ranking system is defined below in Table 2, Natural Diversity Data Base Element Ranking System. Not all special-status species considered in this checklist are tracked by the CNDDB, nor have global or state rarity ranking been given to them; therefore, the author has applied the rules described above to “rank” those special-status species lacking such ranking. Taxa for which Global and State rarity ranking have been devised here are followed by a “?” in parentheses, denoting tentative assignment.
Table 1. Definitions of Special-Status Plant Species
|
1.
Plants legally protected under the California and
Federal Endangered Species Acts or under other regulations. 2.
Plants
considered sufficiently rare by the scientific community to qualify for such
listing; or 3.
Plants
considered to be sensitive because they are unique, declining regionally or
locally, or are at the extent of their natural range. |
|
Special-Status Plant Species |
|
¨
Plants
listed or proposed for listing as threatened or endangered under the Federal
Endangered Species Act (50 CFR 17.12 for listed plants and various notices in
the Federal Register for proposed species). ¨
Plants
that are Category 1 or 2 (species of special concern) candidates for possible
future listing as threatened or endangered under the Federal Endangered
Species Act (55 CFR 6184, February 21, 1990). ¨
Plants
that meet the definitions of rare or endangered species under the CEQA (State CEQA Guidelines, Section 15380). ¨
Plants
considered by the CNPS to be "rare, threatened, or endangered" in
California (Lists 1A, 1B, and 2 in CNPS [2001][4]). ¨
Plants
listed by CNPS as plants about which we need more information and plants of
limited distribution (Lists 3 and 4 in CNPS [2001]). ¨
Plants
listed or proposed for listing by the State of California as threatened or
endangered under the California Endangered Species Act (14 CCR 670.5). ¨
Plants
listed under the California Native Plant Protection Act (California Fish and
Game Code 1900 et seq.). ¨
Plants
considered sensitive by other federal agencies (i.e. U.S. Forest Service,
Bureau of Land Management) or state and local agencies or jurisdictions. ¨
Plants
considered sensitive or unique by the scientific community or occurring at
the limits of its natural range (State
CEQA Guidelines, Appendix G). |
CNPS’s Inventory of Rare and Endangered Plants of California[5] categorizes rare California plants into one of five lists (1A, 1B, 2, 3, & 4) representing the five levels of species status, one of which is assigned to a sensitive species to indicate its status of rarity or endangerment and distribution. A CNPS List is a more general designation than the three separate sets of information provided in a CNPS R-E-D Code (see the CNPS Inventory for definitions). However, the CNPS List is a significant designation in terms of a species’ overall status throughout all of California, and it works well in conjunction to the specifications of the R-E-D Code. The CNPS R-E-D Code is a three-numbered numeric ranking, which is assigned to a special-status species, consisting of one number (1, 2, or 3) for each of the three categories (Rarity-Endangerment-Distribution). Each number accurately describes the species’ population levels and distribution patterns within each category.
As described for the NDDB ranking, not all special-status species (most) considered in this checklist are tracked by CNPS, nor have R-E-D codes been given to them; however, the author has applied the rules described above to “rank” those special-status species lacking such ranking to either “rare” or “uncommon”; however, these rankings are not included in the checklist. Rather the occurrence rankings for each are provided in the Ventura County Rare Plants and in the Flora of Ventura County to be published in 2003 by the author.
The large number of taxa on this list is the result of several factors:
1. Development in Ventura County has eliminated a majority of the natural vegetation in the southern half of the County, eliminating many occurrences of native plant species;
2. A number of taxa found nowhere else are present in Ventura County, local endemics, and several of these are listed as threatened or endangered by either the California Department of Fish and Game or the U.S. Fish and Wildlife Service;
3. Ventura County is geographically situated such that floral influences from the north, south, and east enter the County at its edges (limits of some species’ ranges);
4. Anacapa and San Nicolas Islands support many species found only on the California Channel Islands, including island endemics;
5. Ventura County is topographically and climatically diverse, providing numerous habitats for uncommon and rare species; and
6. Botanical surveys have not been conducted systematically everywhere in the County. In other words, the flora of Ventura County is not fully understood or documented, and additional populations of a number of the plants listed below likely occur in the County, we just aren’t aware of them yet. Regardless, significant collecting has occurred in the County over the last 150 years, and the author has a good understanding of the flora.
This list was compiled according to definitions under the California Environmental Quality Act (CEQA) under Initial Study Checklist Section 6, Subsections A and E. Projects reviewed under CEQA should consider impacts to one or more of the species included in this checklist as potentially significant. Generally, if a project would impact a population of one or more of the plants listed herein, that/those impact(s) should be considered significant unless substantial evidence is provided that may support an alternate conclusion.
What significance does a
list of locally rare species have under CEQA?
The following answer is provided by John Buse, Esq., of the Environmental Defense Center of Ventura, California[6]. The CEQA Guidelines provide that a lead agency shall find that a project may have a significant effect on the environment if the project “… has the potential to … reduce the number or restrict the range of an endangered, rare or threatened species …”. Guidelines § 15065(a). In addition, the CEQA Guidelines Appendix G Environmental Checklist Form considers whether a project would “have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special status species in local or regional plans, policies, or regulations …”.
According to the CEQA Guidelines, a species is considered “rare” when either:
(A) Although not presently threatened with extinction, the species is existing in such small numbers throughout all or a significant portion of its range that it may become endangered if its environment worsens; or
(B) The species is likely to become endangered within the foreseeable future throughout all or a significant portion of its range and may be considered “threatened” as that term is used in the Federal Endangered Species Act. Guidelines § 15380(b)(2).
Table 2. Natural Diversity Database Element Ranking System
Global Ranking (G) |
|
|
G1 |
Less than 6 viable element
occurrences (populations for species) OR less than 1,000 individuals OR less
than 809.4 hectares (ha) (2,000 acres [ac]). |
|
G2 |
6 to 20 element occurrences OR
809.4 to 4,047 ha (2,000 to 10,000 ac). |
|
G3 |
21 to 100 element occurrences OR 3,000 to 10,000 individuals OR
4,047 to 20,235 ha (10,000 to 50,000 ac). |
|
G4 |
Apparently secure; this rank is clearly lower than G3 but
factors exist to cause some concern (i.e. there is some threat, or somewhat
narrow habitat). |
|
G5 |
Population or stand demonstrably secure to ineradicable due to
being commonly found in the world. |
|
GH |
All sites are historic;
the element has not been seen for at least 20 years, but suitable habitat
still exists. |
|
GX |
All sites are extirpated;
this element is extinct in the wild. |
|
GXC |
Extinct in the wild; exists in cultivation. |
|
G1Q |
The element is very rare, but there is a taxonomic question
associated with it. |
|
Subspecies
Level Subspecies
receive a T-rank attached to the
G-rank. With the subspecies, the
G-rank reflects the condition of the entire species, whereas the
T-rank reflects the global situation of just the subspecies or variety. |
|
|
State Ranking (S) |
|
|
S1 |
Less than 6 element occurrences OR less than 1,000 individuals
OR less than 809.4 ha (2,000 ac). S1.1 =
very threatened |
|
S2 |
6 to 20 element occurrences OR 3,000 individuals OR 809.4 to
4,047 ha (2,000 to 10,000 ac). S2.1 = very threatened |
|
S3 |
21
to 100 element occurrences OR 3,000 to 10,000 individuals OR 4,047 to 20,235
ha (10,000 to 50,000 ac). S3.1 = very threatened |
|
S4 |
Apparently
secure within California; this rank is clearly lower than S3 but factors
exist to cause some concern (i.e. there is some threat, or somewhat narrow
habitat). NO THREAT RANK. |
|
S5 |
Demonstrably
secure to ineradicable in California.
NO THREAT RANK. |
|
SH |
All
California sites are historic; the
element has not been seen for at least 20 years, but suitable habitat still
exists. |
|
SX |
All
California sites are extirpated;
this element is extinct in the wild. |
Notes: 1.
Other considerations used when ranking a species or natural community
include the pattern of distribution of the element on the landscape,
fragmentation of the population/stands, and historical extent as compared to
its modern range. It is important to
take a bird’s eye or aerial view when ranking sensitive elements rather than simply
counting element occurrences.
2. Uncertainty about the rank of an element is expressed in two major ways: by expressing the rank as a range of values (e.g., S2S3 means the rank is somewhere between S2 and S3), and by adding a ? to the rank (e.g. S2?). This represents more certainty than S2S3, but less than S2. (CNDDB 2002.)
Species already listed under the California or federal ESA shall be presumed to be endangered, rare, or threatened. Guidelines § 15380(c). A species not currently listed shall nevertheless be considered to be endangered, threatened, or rare if it meets the criteria in the CEQA definitions of “endangered” or “rare”. The term “sensitive” species, which appears in the Appendix G checklist, is not defined in CEQA.
If a species is considered locally rare due to its limited occurrence within a political boundary, such as the County of Ventura, and if the species’ local population constitutes a significant portion of its range, the species must be considered a rare species under CEQA. The mere placement of a species on a list of locally rare species is probably not enough to meet the CEQA criteria for endangered, threatened, or rare species. However, if the list contains some additional explanation indicating why the species meets the CEQA criteria, such as the fact that the local population constitutes a significant portion of the species’ range, the list should provide substantial evidence of rarity.
If the CEQA criteria are satisfied, it is irrelevant that a species is relatively common in other locations. For example, the Pacific Coast populations of the Snowy Plover are listed as threatened under the federal ESA, despite the fact that inland populations are relatively common and are not protected. The existence of the non-listed populations does not diminish the Snowy Plover’s status as a endangered, threatened, or rare species under CEQA. By extension, if the Pacific Coast populations of the Snowy Plover were not listed as threatened, these populations would still be considered endangered, threatened, or rare under CEQA. Accordingly, the special status for Snowy Plover in Ventura County under CEQA would still apply even if Snowy Plover was relatively common in, for example, Mono County. Assertions implying that a species necessarily does not warrant inclusion on a list of locally rare species if it is common elsewhere in California simply because it occurs rarely in Ventura County within a political boundary are incorrect. As the Snowy Plover example indicates, there will be instances when a locally rare species must be considered rare under CEQA despite the species’ common occurrence elsewhere in California.
Snowy Plover on the Pacific Coast is protected under the federal ESA based on the concept of a “distinct population segment” (DPS). Something similar to the DPS concept could be used to determine whether a locally rare species is, in fact, endangered, threatened, or rare under CEQA. The federal ESA allows a DPS, defined according to geographic or reproductive isolation, to be treated as a “species”. Therefore, as in the Snowy Plover example, a DPS can be listed even though the populations of the taxonomic species are common elsewhere. CEQA does not preclude use of the DPS concept to assist in understanding whether a species is endangered, threatened, or rare based on its local rarity; on the contrary, the CEQA Guidelines definition of “rare” appears to invite the consideration of similar circumstances that would inform the determination of a DPS under the federal ESA.
Under CEQA, lead agencies have considerable discretion in determining whether a species should be considered rare or sensitive. See, for example, the State CEQA Guidelines Appendix G checklist cited above, which indicates that lead agencies may designate candidate, sensitive, or special-status species in local or regional plans, policies, or regulations. A list of locally rare or sensitive species, if it is developed based on evidence that the local rarity meets the CEQA criteria for rarity, will effectively establish a rebuttable presumption of significance for species that may be adversely affected by a project. In this respect, a list of locally rare species as presented below will function in a manner similar to the threshold of significance that a lead agency may establish. CEQA requires, however, that thresholds of significance for general use in a lead agency’s environmental review process “must be adopted by ordinance, resolution, rule, or regulation, and developed through a public review process and be supported by substantial evidence.” Guidelines § 15064.7. For a list of locally rare or sensitive species to function as a set of thresholds of significance, therefore, the list should be adopted through a public review process. Even if the list is not adopted through a public review process, it will establish substantial evidence of rarity if it is accompanied by additional information showing, for example, that the local occurrences of a listed species constitute a substantial portion of the species’ range.
CNPS believes that this list of locally rare plants meets the definitions of rarity, at least locally, to satisfy consideration under CEQA. This checklist is supported by substantial evidence in the files of the author and data obtained from public herbaria and knowledgable local botanists. Many of the taxa listed in this checklist are also listed by CNPS as rare or sensitive statewide, as well as those taxa formally listed under the California and/or federal ESA.
This checklist is updated regularly based on new information on the Ventura County flora. Species are added or deleted from this list as the new data warrant; therefore, be sure to obtain the most up-to-date version of this checklist. The most up-to-date version can be downloaded (as a PDF) from the Channel Islands Chapter CNPS website at www.cnpsci.org, or by contacting the author directly. Please send your notes on corrections, errors, and plant populations/occurrences you are aware of that may not be on this checklist to the author: David Magney, P.O. Box 1346, Ojai, CA 93024-1346 or via email at . Also contact the author if you need any specific locality data on any particular taxon included in this checklist.
Checklist
of Rare Plants
Scientific Name[7] Common
Name[8]
Abies lowiana (Gordon
& Glendinning) E. Murray California
White Fir (U) LPNF
Abronia maritima Nutt. ex S.
Watson X A. umbellata Lam. Hybrid Sand-verbena (R) CNPS List 4
Abronia maritima Nutt. ex S.
Watson Red
or Sticky Sand-verbena, Beach Pancake (U)
Abronia pogonantha Heimerl Desert
Sand-verbena (R)
Abronia turbinata Torr. ex S.
Watson Turbinate
Sand-verbena (R)
Abronia villosa S. Watson
var. aurita (Abrams) Jeps. Woolly
Sand-verbena (R)
Acanthomintha obovata var. cordata Jokerst Heartleaf
Thornmint (U)
Acanthomintha obovata Jepson var. obovata Obovate
Thornmint (R)
Achillea millefolium L. var. arenicola (Heller) Nobs in
Ferris Common Island
White Yarrow (R)
Achillea millefolium L. var. californica (Pollard) Jepson California White Yarrow (R)
Achillea millefolium L. var.
occidentale DC. Woolly
White Yarrow (U)
Achillea millefolium L. var. millefolium White
Yarrow (U)
Achillea millefolium L. var. pacifica (Rydb.) G.N. Jones Pacific White Yarrow (R)
Achnatherum aridum (M.E. Jones) Barkworth Mormon
Needlegrass (R)
Achnatherum occidentalis (Thurber) Barkworth ssp. occidentalis Western Needlegrass (R)
Achnatherum occidentalis ssp. pubescens (Vasey) Barkworth Elmer Needlegrass (R)
Achnatherum
thurberianum (Piper)
Barkworth Thurber
Needlegrass (R)
Achyrachaena
mollis Schauer Blow-Wives
(R)
Adenostoma sparsifolium Torrey Red
Shank, Ribbon-bush (U)
Agoseris elata (Nuttall) E. Greene Tall
Mountain Dandelion (R)
Agoseris grandiflora (Nutt.) Greene Bigflower
[Mountain] Dandelion (U)
Agoseris heterophylla
var. cryptopleura Greene Mountain
Dandelion (R)
Agoseris heterophylla
(Nutt.) Greene var. heterophylla Mountain
Dandelion (R)
Agrostis exarata Trin. Western
or Spike Bentgrass (R)
Agrostis pallens Trin. Thingrass
(R)
Agrostis stolonifera var. palustris
(Hudson) Pers. Creeping Bentgrass (R)
Scientific Name Common
Name
Alisma
plantago-aquaticum L. Common or Broadleaf Water-plantain (R)
Allium burlewii A. Davidson Burlew
Onion (U)
Allium
campanulatum S. Watson Sierra
Onion (U)
Allium cratericola Eastw. Cratered
Onion (R)
Allium denticulatum (Traub) D. McNeal Dentate
Fringed Onion (R)
Allium diabloese (Traub) D. McNeal Diablo
Onion (R)
Allium fimbriatum S. Watson var. fimbriatum Fringed
Onion (U)
Allium haemaetochiton S. Watson Red-skinned
Onion (R)
Allium howellii var. clokeyi Traub Mount
Pinos Onion (R, Type)
Allium lacunosum var. davisiae (M.E. Jones) D. McNeal Davis Onion (R, W Limits)
Allium monticola Davidson Mountain
Onion (R)
Allium parryi S.
Watson Parry
Fringed Onion (R)
Allium peninsulare Lemmon var. peninsulare Peninsular
Onion (R)
Allium praecox Brandegee Early
Onion (R)
Allium sanbornii Alph. Wood var. sanbornii Sanborn
Onion (R)
Allium tribracteatum Torrey Three-bracted
Onion (R)
Allophyllum divaricatum (Nuttall) A.D. Grant & V. Grant Divaricate Allophyllum (R)
Allophyllum gilioides (Bentham) A.D. Grant & V. Grant ssp. gilioides Straggling Gilia (R)
Allophyllum
gilioides ssp.
violaceum (A.A. Heller) Day Violet
Phlox (R)
Allophyllum glutinosum (Bentham) A.D. Grant & V. Grant Sticky Allophyllum (R)
Alnus incana
ssp. tenuifolia (Nuttall) Breitung Mountain
Alder (R, Disjunct, S Limits)
Alopecurus carolinianus Walter Carolina
Foxtail (R)
Alopecurus saccatus Vasey Pacific
Foxtail (R)
Amaranthus blitoides S. Watson Prostrate
Amaranth (R)
Amaranthus californicus (Moq.) S. Watson California
Amaranth (R)
Amaranthus palmeri S. Watson Palmer
Amaranth (R)
Amaranthus powellii S. Watson Powell
Amaranth (R)
Amblyopappus pusillus Hook. & Arn. Dwarf
or Coast Amblyopappus (R)
Ambrosia
chamissonis (Less.) E. Greene Beach
Bur (U)
Ambrosia
salsola var. fasiculata (A.
Nelson) Stother & B.G. Baldwin White
Burrobrush (R)
Ambrosia salsola (T.&G. Ex G.) Stother & B.G. Baldwin var. salsola Burrobrush
(R)
Amelanchier alnifolia var. pumila (Nuttall) Nelson Alderleaf Service-berry (R)
Amelanchier pallida E. Greene Western
or Pallid Service-berry (R, Type)
Amelanchier utahensis Koehne Utah
Service-berry (R)
Ammannia coccinea Rottb. Long-leaved
or Purple Ammannia (R)
Amsinckia douglasiana A. DC. Douglas
Fiddleneck (R)
Amsinckia menziesii (Lehm.) Nelson & J.F. Macbr. var. menziesii Common or Menzeis Fiddleneck (U)
Amsinckia spectabilis Fischer & C. Meyer var. spectabilis Showy Fiddleneck (R)
Amsinckia tessellata Gray var.
tessellata Devil’s
Lettuce, Tessellate Fiddleneck (R)
Amsinckia tessellata var.
gloriosa (Suksd.) Hoover Glorious
Fiddleneck (R)
Ancistrocarphus filagineus Gray Woolly
Fishhooks (U)
Andropogon glomeratus var. scabriglumis C.S. Campbell Southwestern Bushy Bluestem (R)
Anisocoma acaulis Torrey & A. Gray Scale
Bud (R)
Antennaria dimorpha (Nuttall) Torrey & A. Gray Low
Everlasting (R)
Antirrhinum coulterianum Bentham ssp. coulterianum White
Snapdragon (R)
Antirrhinum kelloggii Greene Kellogg
Snapdragon (U)
Antirrhinum
nuttallianum forma pusillum (Brandagee) Munz Nuttall Snapdragon (R)
Antirrhinum ovatum Eastwood Oval-leaved
Snapdragon (R)
Aphanisma
blitoides Moq. Aphanisma (R)
Apiastrum angustifolium Nuttall Wild
Celery, Mock Parsley (R)
Apocynum androsaemifolium L. ssp. androsaemifolium Bitter
Dogbane (U)
Apocynum
cannabinum L. Indian
Hemp (Type)
Apocynum Xmedium E. Greene (A. androsaemifolium ssp.
a. var. incanum X A. cannabinum var.
hypericifolium) Bitter Dogbane (R)
Aquilegia eximia Van Houtte ex Planchon Van Houtte
Columbine (R)
Aquilegia formosa var.
truncata (Fischer & C.A. Meyer) Baker Truncate
Crimson Columbine (U)
Arabis breweri S. Watson var. breweri Brewer
Rock Cress (R, S Limits)
Scientific Name Common
Name
Arabis glabra (L.) Benth. var. glabra Tower Mustard (U)
Arabis hoffmannii (Munz) Rollins Hoffmann
Rock Cress (R/E)
Arabis holboellii var. retrofracta (Graham) Rydb. Holboell Rock Cress (R)
Arabis pulchra M.E. Jones var. gracilis M.E. Jones Desert Rock Cress (R, SW Limits)
Arabis repanda S. Watson
var. repanda Yosemite
Rock Cress (R)
Arabis sparsiflora T. & G.
var. arcuata (Nutt.) Rollins Few-flowered Rock Cress (U)
Arabis sparsiflora T. & G. var. sparsiflora Few-flowered
Rock Cress (R)
Aralia californica S. Watson Elk
Clover, Spikenard (R)
Arbutus menziesii Pursh Pacific
Madrone (R)
Arceuthobium abietinum (Engelm.) Hawksw. & Wiens Dwarf
Fir Mistletoe (R)
Arceuthobium californicum Hawksworth & Wiens Sugar
Pine Dwarf Mistletoe (R)
Arceuthobium campylopodum Engelm. Western
Dwarf Mistletoe (U)
Arceuthobium cyanocarpum Coulter & A. Nelson Limber
Pine Dwarf Mistletoe (R)
Arceuthobium
divaricatum Engelm. Pinyon
Dwarf Mistletoe (U)
Arceuthobium
occidentale Engelm. Foothill
Pine Dwarf Mistletoe (R)
Arctostaphylos
glandulosa Eastw. ssp. glandulosa Eastwood Manzanita (U)
Arctostaphylos
glandulosa Eastw. X.A. glauca
Lindley Eastwood-Bigberry
Manzanita Hybrid (R)
Arctostaphylos
glandulosa ssp. adamsii (Munz) Munz Adams Eastwood
Manzanita (R)
Arctostaphylos
glandulosa ssp. glaucomollis P. Wells Transverse Ranges
Manzanita (U)
Arctostaphylos
glandulosa ssp. zacaensis (Eastw.) P. Wells Zaca Lake Manzanita (U)
Arctostaphylos
patula Greene Greenleaf
Manzanita (R)
Arctostaphylos
pungens H.B.K. Pungent
Manzanita (R)
Aristida
adscensionis L. Six-weeks Three-awn Grass (R)
Aristida
divaricata Humb. & Bonpl. ex Willd. Poverty Three-awn Grass (R)
Aristida ternipes var. hamulosa (Henrard) J.S. Trent Hook Three-awn Grass (R)
Artemisia ludoviciana Nuttall ssp. ludoviciana Silver
or Western Mugwort (R)
Artemisia nesiotica Raven Island
Sagebrush (R)
Artemisia tridentata ssp. parishii (Gray) H.M. Hall & Clements Parish Great Basin Sagebrush (R,
W Limits)
Artemisia tridentata ssp. vaseyana (Rydb.) Beetle Vasey Great Basin or Mountain
Sagebrush (R)
Arthrocnemum [Salicornia]
subterminalis (Parish) Standley Common
or Parish Glasswort (R)
Asclepias erosa Torrey Desert
Milkweed (R)
Asclepias vestita Hook. & Arn. Woolly
Milkweed (R)
Aspidotis californica (Hooker) Nuttall ex Copeland California Lace
Fern (U)
Asplenium vespertinum Maxon Western Spleenwort (R)
Aster ascendens Lindley Long-leaved
Aster (R)
Aster chilensis Nees Common
California Aster (U)
Aster greatae Parish Greata’s
Aster (R)
Aster lanceolatus ssp. hesperius (Gray) Semple & Chmielewski Siskiyou
Aster (R)
Astragalus asymmetricus E. Sheldon Cockeyed
Milkvetch (R)
Astragalus brauntonii Parish Braunton
Milkvetch (R)
Astragalus didymocarpus Hook. & Arn. var. didymocarpus Two-seeded Milkvetch (R)
Astragalus didymocarpus var. dispermus (A. Gray) Jepson Disperse Two-seeded Milkvetch (R)
Astragalus didymocarpus var. milesianus (Rydb.) Jeps. South Coast Two-seeded Milkvetch (R)
Astragalus
didymocarpus var. obispoensis (Rydb.) Jeps. San Luis Obispo
Two-seeded Milkvetch (R)
Astragalus douglasii
(T. & G.) Gray var. douglasii Douglas
Milkvetch (R)
Astragalus douglasii var. parishii (Gray) M.E. Jones Parish Milkvetch (R)
Astragalus filipes Gray Thread-leaved
Locoweed (R)
Astragalus gambelianus E. Sheldon Dwarf
Locoweed (R)
Astragalus lentiginosus Hook. var. diphysus Freckled
Locoweed (R)
Astragalus lentiginosus var. nigricalycis M.E. Jones Black-sepaled Freckled Locoweed (R)
Astragalus
lentiginosus var. sierrae M.E. Jones Bear Valley Milkvetch (R)
Astragalus leucolobus M.E. Jones Bear
Valley Woollypod (R)
Astragalus
macgregorii (Rydb.) Tidestr. MacGregor
Locoweed (R, Type)
Astragalus macrodon (Hook. & Arn.) Gray Salinas
Valley Milkvetch (R)
Astragalus miguelensis Greene San
Miguel Milkvetch (R)
Astragalus oxyphysus Gray Robust
Milkvetch (R)
Scientific Name Common
Name
Astragalus pachypus Greene var. pachypus Milkvetch
(U)
Astragalus pachypus var. jaegeri
Munz Jaeger
Milkvetch (R,
N Limits)
Astragalus
pycnostachyus var. lanosissimus (Rydb.) Munz Ventura
Marsh Milkvetch (R/E)
Astragalus traskiae Eastwood Trask
Locoweed or Milkvetch (R)
Astragalus trichopodus (Nutt.) Gray var. trichopodus Three-pod Milkvetch (R)
Astragalus trichopodus var. lonchus (M.E. Jones) Barneby Three-pod Milkvetch (R)
Astragalus whitneyi Gray var. whitneyi Whitney
Locoweed (R)
Astragalus whitneyi var. pinosus Elmer Mount
Pinos Locoweed (R, Type)
Athysanus pusillus (Hook.) Greene Dwarf
Athysanus (R)
Atriplex argentea var.
mohavensis M.E. Jones Mojave
Silverscale (R)
Atriplex
californica Moq. California
Saltbush (U)
Atriplex canescens ssp. linearis (S. Watson) H.M. Hall & Clements Narrowleaf Fourwing Saltbush (R)
Atriplex coulteri (Moq.) D. Dietr. Coulter
Saltbush (R)
Atriplex lentiformis (Torrey) S. Watson ssp. lentiformis Big Saltbush, Quailbrush (R, W Limits)
Atriplex leucophylla (Moq.) D. Dietr. Whiteleaf,
Beach Saltbush or Seascale (U)
Atriplex pacifica Nelson South
Coast Saltbush (R)
Atriplex polycarpa (Torrey) S.
Watson Common
Saltbush, Allscale (R)
Atriplex serenana Nelson var. serenana Bractscale
(R)
Atriplex serenana var. davidsonii (Standley) Munz Davidson Bractscale (R)
Atriplex subspicata (Nutt.) Rydb. Saline
Saltscale (R)
Atriplex triangularis Willd. Spearscale
(R)
Atriplex
watsonii Nelson Matscale
(R)
Azolla filiculoides Lam. Duckweed Fern (U)
Baccharis douglasii DC. Marsh
Baccharis, Douglas False-willow
Baccharis emoryi Gray Emory
Baccharis (R)
Baccharis malibuensis Beauchamp & Henrickson Malibu
Baccharis (R)
Baccharis plummerae Gray var.
plummerae Plummer
Baccharis (U) CNPS List 4
Balsamorhiza
deltoidea Nuttall Balsamroot,
Chuchupate (U)
Barbarea orthoceras Ledeb. American Wintercress (R)
Batis maritima
L. Saltwort,
Beachwort (R)
Berberis dictyota Jeps. Dull-leaf
or Jeps. Holly-leaved Barberry (R)
Berberis pinnata ssp. insularis Munz Island Barberry (R)
Berula erecta
(Huds.) Coville Cutleaf
Water-parsnip (R)
Bidens frondosa L. Sticktight (R)
Bidens laevis (L.) Britton,
Sterns & Pogg. Bur-marigold (R)
Bloomeria crocea ssp. montana (E. Greene) Ingram Mountain Goldenstars (R)
Bolboschoenous maritimus (L.) Palla var. paludosus (Nelson) Koyama Saltmarsh Bulrush (R)
Bolboschoenous maritimus X B. robustus Hybrid
Bulrush (R)
Bolboschoenous robustus (Pursh) Soják, Čas. Nár. Seashore
Bulrush (R)
Boschniakia strobilacea Gray Ground
Cone (R)
Bothriochloa barbinodis (Lagasca) Herter Cane
Bluestem (R)
Botrychium simplex E. Hitchc. Least Moonwort, Little Grapefern (R)
Bowlesia incana Ruiz
Lopez & Pavon Hoary
Bowlesia (U)
Boykinia
occidentalis T. & G. Santa
Lucia Brookfoam (R)
Boykinia rotundifolia C. Parry Roundleaved
Boykinia (R)
Brickellia californica (T. & G.) Gray X B. nevinii Gray California-Nevin
Brickellbush Hybrid (R)
Brodiaea terrestris ssp. kernensis (Hoover) Niehaus Harvest Brodiaea (R)
Bromus arizonicus (Shear) Stebbins Arizona
Brome
(R)
Bromus grandis (Shear) A. Hitchc. Tall
or Grand Brome (R)
Bromus laevipes Shear Woodland
Brome
(R)
Bromus orcuttianus (Shear) A. Hitchc. Orcutt
Brome
(R)
Bromus pseudolaevipes Wagnon Woodland
Brome
(R)
Cakile edentula (Bigelow) Hooker ssp. edentula American
Searocket (R)
Calandrinia breweri S. Watson Brewer
Calandrinia (R) CNPS List 4
Calandrinia maritima Nutt. Seaside
Redmaids (R) CNPS List 4
Callitriche marginata Torrey California
Water-starwort, Wallow Starwort (R)
Scientific Name Common
Name
Calocedrus
decurrens (Torrey) Florin Incense
Cedar (U)
Calochortus
catalinae S. Watson Catalina
Mariposa Lily (U) CNPS List 4
Calochortus clavatus S. Watson ssp. clavatus Club-haired
Mariposa Lily (U) CNPS List 4
Calochortus clavatus ssp. pallidus (Hoover) Munz Pale
Yellow Mariposa Lily (R)
Calochortus invenustus E. Greene Plain
Mariposa Lily (U)
Calochortus luteus Lindley Gold
Nuggets (R)
Calochortus
palmeri S. Watson var. palmeri Palmer Mariposa
Lily (R) CNPS List
1B
Calochortus plummerae Greene Plummer
Mariposa Lily (R) CNPS List
1B
Calochortus splendens Benth. Splendid
or Lilac Mariposa Lily (U)
Calochortus weedii var. vestus Purdy Weed
Mariposa Lily (R) CNPS List
1B
Calyptridium monospermum Greene One-seeded
Pussy Paws (R)
Calyptridium parryi Gray var.
parryi Parry
Calyptridium (U)
Calyptridium umbellatum (Torrey) Greene Pussy
Paws (U)
Calystegia macrostegia ssp. amplissima Brummitt Island
Morning-glory (R)
Calystegia macrostegia (E. Greene) Brummitt ssp. macrostegia Morning-glory (U)
Calystegia malacophylla ssp. tomentella var. deltoidea (Greene) MunzTehachapi
Morning-glory (R)
Calystegia occidentalis ssp. fulrata (Gray) Brummitt Western Morning-glory (R)
Calystegia occidentalis ssp. tomentella (E. Greene) Brummitt Woolly
Western Morning-glory (R)
Calystegia purpurata (Greene) Brummitt ssp. purpurata Purple Morning-glory (U)
Calystegia sepium ssp.
binghamiae (Greene) Brummitt Bingham
Morning-glory (R) CNPS
List 1A
Calystegia soldanella
(L.) R.Br. Beach
Morning-glory (U)
Camissonia campestris
cf. ssp. obispoensis Raven San
Luis Obispo Sun-cup (R)
Camissonia
cheiranthifolia (Sprengel) Raim ssp. cheiranthifolia Beach Primrose (R)
Camissonia
cheiranthifolia ssp. suffruticosa (S. Watson) Raven Beach Primrose (U)
Camissonia confusa Raven Confusing
Primrose (R)
Camissonia
graciliflora (Hooker & Arnott) Raven Hill Sun-cup (R)
Camissonia ignota (Jepson)
Raven Small
Primrose (U)
Camissonia luciae Raven Santa
Lucia Sun-cup (R)
Camissonia micrantha (Sprengel) Raven Tiny
Primrose (R)
Camissonia pallida
(Abrams) Raven ssp. pallida Pale
Primrose (R)
Camissonia palmeri
(S. Watson) Raven Palmer
Primrose (R)
Cardamine breweri S. Watson var. breweri Bitter-cress (R)
Cardamine californica (T. & G.) Greene var. californica California Milkmaids (R)
Cardamine oligosperma Torrey & Gray Few-seeded
Bitter-cress (R)
Cardamine pachystigma (S. Watson) Rollins var. pachystigma Toothwort (R)
Cardaria
chalepensis (L.) Hand.-Mazz. Lens-Podded
Hoary Cress (R)
Cardionema ramosissimum (Weinm.) A. Mels. & J.F. Macbr. Sand Mat (R)
Carex abrupta Mackenzie Abrupt-beaked
Sedge
(R)
Carex alma L.
Bailey Sturdy
Sedge
(R)
Carex athrostachya Olney Slender-beaked
Sedge
(R)
Carex aurea Nuttall Golden-fruited
Sedge
(R)
Carex barbarae Dewey Santa
Barbara Sedge (R)
Carex bolanderi Olney Bolander
Sedge (R)
Carex densa L.
Bailey Dense
Sedge (R)
Carex douglasii Boott Douglas
Sedge
(R)
Carex filifolia var. erostrata
Kük. Short-grass
Sedge (R)
Carex fracta Mackenzie Fragile-sheathed
Sedge
(R)
Carex globosa Boott Round-fruited
Sedge
(R)
Carex lanuginosa Michaux Woolly
Sedge
(R)
Carex multicaulis L. Bailey Many-stemmed
Sedge
(R)
Carex nebrascensis
Dewey Nebraska
Sedge (R)
Carex pansa L.
Bailey Sand
Dune Sedge (R)
Carex praegracilis W. Boott Clustered
Field Sedge (U)
Carex senta
Boott Rough
Sedge
(U)
Carex subfusca W. Boott Brown
Sedge
(U)
Carex triquetra Boott Triangluar-fruited
Sedge
(R)
Scientific Name Common
Name
Castilleja angustifolia (Nuttall) G. Don Desert
Indian Paintbrush (R)
Castilleja applegatei ssp. disticha (Eastw.) Chuang & Heckard Eastwood Indian Paintbrush (R)
Castilleja attenuata (Gray) Chuang
& Heckard Valley
Tassels (R)
Castilleja densiflora (Benth.) Chuang & Heckard ssp. densiflora Dense-flowered Owl's Clover (R)
Castilleja foliolosa Hook. & Arn. Woolly
Indian Paintbrush (U)
Castilleja gyroloba Pennell Indian
Paintbrush (R, Type)
Castilleja lanata ssp. hololeuca (Greene) Chuang & Heckard White-felted Indian Paintbrush (R)
Castilleja
linariifolia Benth. Linaria-leaved Indian Paintbrush (R)
Castilleja miniata Hook. ssp. miniata Great
Red Indian Paintbrush (R)
Castilleja minor ssp. spiralis (Jeps.) Chuang & Heckard Large-flowered
Annual Indian Paintbrush (R)
Castilleja mollis Pennell Soft-leaved
Indian Paintbrush (R)
Castilleja subinclusa ssp. franciscana (Pennell) Chuang & Heckard San Francisco Long-leaved Indian
Paintbrush (R)
Caulanthus amplexicaulis S. Watson var. amplexicaulis Clasping-leaved
Jewelflower (R)
Caulanthus californicus (S. Watson) Payson California
Jewelflower (R)
Fed-Endangered
Caulanthus coulteri S. Watson var. coulteri Coulter
Jewelflower (U)
Caulanthus coulteri var. lemmonii (S. Watson) Munz Lemmon Jewelflower (R)
Caulanthus heterophyllus
(Nutt.) Payson var. heterophyllus Different-leaved
Jewelflower (R)
Caulanthus inflatus S. Watson Desert
Candle
(R)
Ceanothus dentatus T. & G. Dentate
Ceanothus (R)
Ceanothus greggii ssp. vestitus (Greene) McMinn Mojave Ceanothus (U)
Ceanothus megacarpus var. insularis (Eastw.) Munz Island
Ceanothus (R)
Ceanothus megacarpus var. pendulous McMinn Pendulous
Bigpod Ceanothus (R)
Ceanothus oliganthus var. sorediatus (Hook. & Arn.) Hoover Jim Brush (R)
Ceanothus palmeri Trel. Palmer
Ceanothus (U)
Ceanothus papillosus T. & G. ssp. papillosus Wartleaf
Ceanothus (R)
Ceanothus papillosus ssp. roweanus (McMinn) Munz Rowean
Wartleaf Ceanothus (R)
Celtis reticulata Torrey Netleaf
Hackberry (R)
Centaurium exaltatum (Griseb.) W. Wright ex Piper Great Basin Centaury (R)
Centaurium venustum (A. Gray) B.L. Robins. ssp. venustum Beautiful Centaury, Canchalagua (R)
Centromadia parryi ssp. australis (Keck) B.G. Baldwin Southern Tarplant (R)
Centrostegia thurberi var. macrotheca Thurber
Spineflower (R)
Ceratophyllum demersum L. Hornwort, Coontail (R)
Cercocarpus betuloides var. blancheae (C. Schneider) Little Island Mountain Mahogany (R)
Cercocarpus ledifolius var. intermontanus N. Holmgren Cut-leaved Mountain Mahogany (U)
Chaenactis artemisiifolia (Gray) Gray White
Pincushion (R)
Chaenactis fremontii A. Gray Desert
Pincushion (R)
Chaenactis glabriuscula var. heterocarpha (A. Gray) H.M. Hall Different-seeded Yellow Pincushion (R)
Chaenactis glabriuscula var. lanosa (DC.) H.M. Hall Woolly
Yellow Pincushion (R)
Chaenactis glabriuscula var. megacephala A. Gray Big-flowered
Yellow Pincushion (R)
Chaenactis glabriuscula var. orcuttiana (Greene) H.M. Hall Woolly Yellow Pincushion (R) CNPS List 1B
Chaenactis stevioides Hook. & Arn. Desert
Pincushion (R)
Chaenactis xantiana Gray Xantus
Pincushion (R)
Chamaesyce
albomarginata (Torrey & A. Gray) Small Rattlesnake
Spurge (U)
Chamaesyce ocellata (Durand &
Hilg.) Millsp. ssp.
ocellata Littleye Spurge (R)
Chamaesyce polycarpa (Benth.) Millsp. Golondrina (R)
Cheilanthes clevelandii
D.C.
Eaton. Cleveland Lip-fern (R)
Cheilanthes cooperae D.C. Eaton Mrs.
Cooper Lip-fern (R)
Cheilanthes newberryi (D.C. Eaton)
Domin Cotton Fern (R)
Chenopodium
atrovirens Rydb. Pigweed (R)
Chenopodium
berlandieri Moq. Pitseed Goosefoot (U)
Chenopodium
fremontii S. Watson Fremont
Goosefoot (U)
Chenopodium
pratericola Rydb. Narrow-leaved Goosefoot (R)
Chorizanthe blakleyi Hardham Blakley’s
Spineflower (R)
Chorizanthe clevelandii C. Parry Cleveland
Spineflower (R)
Chorizanthe douglasii Benth. Douglas
Spineflower (R)
Chorizanthe membranacea Benth. Pink
Spineflower (R)
Scientific Name Common
Name
Chorizanthe parryi var. fernandina (S. Watson) Jepson San Fernando Valley Spineflower (R) Endangered
Chorizanthe procumbens Nutt. Prostrate
Spineflower (R)
Chorizanthe staticoides forma bracteata Goodman Bracted
Turkish Rugging (R, Type)
Chorizanthe
uniaristata T. & G. One-awned Spineflower (R)
Chorizanthe watsonii T. & G. Watson
Spineflower (R)
Chorizanthe xantii S. Watson var. xantii Xantus
Spineflower (U)
Chrysothamnus
nauseosus ssp.
albicaulis (Nutt.) Hall & Clem. White-stemmed Rubber Rabbitbrush (R)
Chrysothamnus nauseosus ssp. bernardinus (Hall) Hall & Clements San Bernardino Rubber Rabbitbrush (R)
Chrysothamnus nauseosus ssp. consimilis (Greene) Hall & Clements Common Rubber Rabbitbrush (U)
Chrysothamnus parryi ssp. asper (Greene) Hall & Clements Parry Rabbitbrush (R)
Chrysothamnus teretifolius (Durand & Hilg.) H.M. Hall Round-leaved
Rabbitbrush (R)
Chrysothamnus viscidiflorus (Hook.) Nutt. ssp. viscidiflorus Yellow Rabbitbrush (R)
Cicuta douglasii (DC.) Coulter & Rose Western
Water-hemlock (R)
Cirsium brevistylum Cronq. Indian
Thistle (R)
Cirsium occidentale var. venustum (E. Greene) Jepson Red or Venus Thistle (U)
Cirsium scariosum Nuttall Elk
Thistle (R)
Clarkia affinis Lewis & Lewis Hairy
Clarkia (R)
Clarkia cylindrica (Jepson) H. Lewis & M. Lewis ssp. cylindrica Cylindrical Godetia (R)
Clarkia cylindrica ssp. clavicarpa W. Davis Cylindrical
Godetia (R)
Clarkia dudleyana (Abrams)
J.F. Macbr. Dudley
Godetia (R)
Clarkia
epilobioides (Nutt.) A. Nels. & J.F. Macbr. Willow-herb Godetia (R)
Clarkia modesta Jeps. Modest Clarkia (R)
Clarkia purpurea ssp. viminea (Douglas) Lewis & Lewis Large Purple Clarkia (R)
Clarkia rhomboidea Douglas Rhomboid
Clarkia (R)
Clarkia xantiana Gray ssp. xantiana Xantus
Clarkia (R)
Claytonia exigua T. & G. ssp. exigua Small
Miner's Lettuce (U)
Claytonia parviflora Hook. ssp. parviflora Small-flowered
Miner's Lettuce (U)
Claytonia parviflora ssp. viridis (Davidson) J.M. Miller & Chambers Small-flowered Miner's Lettuce (R)
Claytonia perfoliata ssp. mexicana (Rydb.) J.M. Miller & Chambers Miner's Lettuce (U)
Claytonia rubra (J.T. Howell) Tidestrom ssp. rubra Red Miner's Lettuce (U)
Collinsia bartsiifolia var. davidsonii (Parish) V. Newsom Davidson White Chinese
Houses
(R)
Collinsia callosa Parish Large-fruited
Blue-eyed Mary (R)
Collinsia parryi A. Gray Parry
Blue-eyed Mary (R)
Collinsia parviflora Lindley Blue-eyed
Mary, Blue Lips (R)
Collinsia torreyi var. wrightii (S. Watson) I.M. Johnston Wright Blue-eyed Mary (R)
Collomia grandiflora Lindley Large-flowered
Collomia (R)
Collomia tinctoria Kellogg Yellow-staining
Collomia (R)
Comarostaphylis diversifolia (C. Parry) Greene ssp. diversifolia Summer Holly (R)
Convolvulus simulans Perry Small-flowered
Morning-glory (R)
Conyza coulteri Gray Coulter
Horseweed (R)
Cordylanthus maritimus Benth. ssp. maritimus Saltmarsh
Birds-beak (R) Listed E
Cordylanthus nevinii A. Gray Nevin
Bird’s-Beak (U)
Cordylanthus rigidus ssp. setiferus Chuang & Heckard Dark-tipped Rigid Bird’s-Beak (U)
Coreopsis calliopsidea (DC.) A. Gray Leafy-stemmed
Coreopsis (R)
Cornus glabrata Bentham Brown
Dogwood (R)
Cornus sericea L. ssp. sericea American
or Creek Dogwood (R)
Crassula aquatica (L.) Schönl. Water
Pigmy-Weed (R)
Crepis acuminata Nuttall Long-leaved
Hawksbeard (R)
Crepis occidentalis Nuttall ssp. occidentalis Western
Hawksbeard (U)
Crepis
occidentalis ssp. pumila (Rydb.) Babcock & Stebbins Western Hawksbeard (R)
Cressa truxillensis Kunth var. truxillensis Spreading
Alkali-Weed (R)
Cryptantha barbigera (A. Gray) E. Greene Bearded
Forget-Me-Not (R)
Cryptantha clevelandii E. Greene Cleveland
Forget-Me-Not (R)
Cryptantha corollata (I.M. Johnston) I.M. Johnston Crowned
Forget-Met-Not (R, Type)
Cryptantha decipiens (M.E. Jones) A.A.Heller Gravel
Forget-Me-Not (R)
Cryptantha echinella E. Greene Prickly
Forget-Me-Not (U)
Scientific Name Common
Name
Cryptantha flaccida (Lehm.) E. Greene Flaccid
Forget-Me-Not (R)
Cryptantha leiocarpa (Fischer & C. Meyer) E. Greene Coast
Forget-Me-Not (R)
Cryptantha maritima (Greene) Greene Seaside
Forget-Me-Not (R)
Cryptantha micrantha (Torrey) I.M. Johnston Eremocarya (R)
Cryptantha micromeres (A. Gray) E. Greene Minute-flowered
Forget
(R)
Cryptantha microstachys (A. Gray) E. Greene Tejon
Forget-Me-Not (U)
Cryptantha mohavensis (Greene) Greene Mojave
Forget-Me-Not (R)
Cryptantha nemaclada E. Greene Colusa
Forget-Me-Not (U)
Cryptantha nevadensis A. Nelson & Kennedy Nevada
Forget-Me-Not (R)
Cryptantha oxygona (A. Gray) E. Greene) Sharp-not
Forget-Me-Not (R)
Cryptantha simulans E. Greene Pine
Forget-Me-Not (R)
Cryptantha torreyana (A. Gray) E. Greene Torrey
Forget-Me-Knot (R)
Cryptantha traskiae I.M. Johnston Trask
Forget-Me-Not (R)
Cuscuta
californica var. breviflora Engelmann California
Dodder (R)
Cuscuta
denticulata Engelmann Desert
Dodder (R)
Cuscuta
indecora Choisy var. indecora Pretty
Dodder (R)
Cuscuta
pentagona Engelmann Field
Dodder (R)
Cuscuta salina var.
major Yuncker Saltmarsh
Dodder (R)
Cuscuta subinclusa
Durand & Hilg. Canyon
Dodder (U)
Cycladenia humilis
var. venusta (Eastwood) Munz Elegant
Cycladenia (R)
Cyperus acuminatus
Torrey & Hook. Short-pointed Umbrella-sedge (R)
Cyperus erythrorhizos Muhlenb. Red-root
Flatsedge (R)
Cyperus laevigatus L. Smooth Flatsedge (R)
Cyperus odoratus L. Flatsedge (R)
Cyperus squarrosus L. Awned
Flatsedge (R)
Cystopteris fragilis (L.) Bernhardi Brittle or Fragile Fern (R)
Deinandra clementina (Brandegee) B.G. Baldwin Island
or Catalina Tarplant (R)
Deinandra kelloggii (E. Greene) E. Greene Kellogg
Tarplant (R)
Deinandra minthornii (Jepson) B.G.
Baldwin Santa
Susana Tarplant (R, Type) Listed R
Delphinium cardinale Hooker Scarlet
or Cardinal Larkspur (U)
Delphinium gracilentum Greene Coast
Larkspur (R)
Delphinium gypsophilum Ewan ssp. gypsophilum Gypsum
Larkspur (R) CNPS List 4
Delphinium inopinum (Jeps.) H.F. Lewis & Epling Unexpected
Larkspur (R) CNPS List
1B
Delphinium parryi ssp. blochmaniae (Greene) F.H. Lewis & Epling Dune Larkspur (R) CNPS List 1B
Delphinium parryi ssp. maritimum (Davidson) M.J. Warnock Maritime Larkspur (R)
Delphinium parryi ssp. purpureum (F. Lewis & Epling) M.J. Warnock Mount Pinos Larkspur (U) CNPS List 4
Delphinium patens ssp. hepaticoideum Ewan Spreading
Larkspur (R)
Delphinium patens ssp. montanum (Munz) Ewan Mountain
Spreading Larkspur (R)
Delphinium umbraculorum F.H. Lewis & Epling Umbrella
Larkspur (R) CNPS List
1B
Deschampsia
cespitosa (L.) Beauv.
ssp. cespitosa Tufted
Hairgrass (R)
Deschampsia danthanoides (Trin.) Munro ex Bentham Annual
Hairgrass (R)
Descurainia obtusa ssp. adenophora (Wooton & Standley) Detl. Desert Tansy Mustard (R)
Descurainia pinnata ssp. halicotorum (Cockerell) Detl. Western Tansy Mustard (R)
Descurainia pinnata ssp. menziesii (DC.) Detl. Menzies
Tansy Mustard
Dicentra ochroleuca Engelm. White
Eardrops, Yellow Dicentra (R)
Dicentra pauciflora S. Watson Few-flowered
Bleeding Heart (R)
Dichelostemma congestum (Sm.) Kunth Ookow (R)
Dichondra occidentalis House Western
Dichondra (R) CNPS List 4
Dithyrea maritima (A. Davids.) Davidson Beach
Spectacle-pod (R)
Dodecatheon alpinum (A. Gray) E. Greene Alpine
Shooting Star (R)
Dodecatheon clevelandii ssp. insulare H.L. Thompson Island Shooting
Star (R)
Dodecatheon clevelandii ssp. patulum (Greene) Thompson Lowland Padre Shooting Star (R)
Dodecatheon clevelandii ssp. sanctarum (E. Greene) Abrams Cleveland Shooting Star (U)
Downingia bella Hoover Hoover
Downingia (R)
Draba cuneifolia T.
& G. Wedgeleaf
Draba (R)
Scientific Name Common
Name
Dudleya abramsii ssp. parva
(Rose & Davids.) J.
Bartel Conejo
Live-forever (R) Listed T
Dudleya blochmaniae (Eastw.) Moran ssp. blochmaniae Blochman Live-forever (R) CNPS List 1B
Dudleya caespitosa
(Haw.) Britt. &
Rose Sea
Lettuce (R)
Dudleya cymosa ssp. marcescens Moran Marcescent
Live-forever (R, Type) Listed T
Dudleya cymosa ssp.
ovatifolia (Britt.) Moran Santa
Monica Mtns. Live-forever (R)
(Listed T
Dudleya cymosa ssp. pumila (Rose) K. Nakai Pygmy
Live-forever (U)
Dudleya farinosa (Lindley) Britt. & Rose Farinose
Live-forever (R)
Dudleya pulverulenta ssp. arizonica (Rose) Moran Chalky
Live-forever (R)
Dudleya verityi N. Nakai Verity
Live-forever (R) Listed T
Dudleya virens (Rose) Moran Bright
Green Live-forever (R)
Eastwoodia elegans Brandegee Yellow
Mock Aster (R)
Elatine brachysperma Gray Slender
Waterwort (R)
Elatine californica Gray California
Waterwort (R)
Eleocharis acicularis (L.) Roemer & Schultes var. acicularis Slender Spike-rush (U)
Eleocharis bernardina Munz & Johnston Few-flowered
Club-rush (R)
Eleocharis macrostachya Britt. Common
Spike-rush (U)
Eleocharis montevidensis Kunth Sand
Spike-rush (R)
Eleocharis parishii Britt. Parish
Spike-rush (U)
Eleocharis rostellata (Torrey) Torrey Beaked
Spike-rush (R)
Elodea canadensis Rich. Common
Waterweed (R)
Elymus glaucus
ssp. jepsonii (Burtt Davy) Gould Jepson
Blue or Woodland Wildrye (R)
Elymus multisetus (J.G. Smith) Burtt Davy Bottlebrush
Squirreltail (R)
Elymus stebbinsii (Scribner & J.G. Smith) Gould Wheatgrass (R)
Elymus trachycaulus (Link) Shinn. ssp. trachycaulus Slender
Wheatgrass (R)
Encelia actoni Elmer Acton
Brittlebush (R)
Encelia frutescens (Gray) Gray Brittlebush,
Incienso (R)
Encelia virginiensis Nelson Brittlebush (R)
Enemion occidentale (H. & A.) J.R. Drummond & Hutchinson Western Meadow-rue (R)
Ephedra californica S. Watson California Desert Tea, Cañatillo (R)
Ephedra nevadensis S. Watson Nevada
Ephedra or Mormon-tea (R)
Epilobium brachycarpum C. Presl Panicled
Willow-herb (U)
Epilobium canum ssp. latifolium (Hook.) Raven Broad-leaved California
Fuchsia (U)
Epilobium ciliatum ssp. glandulosum (Lehm.) P. Hoch & Raven Sticky Northern Willow-herb (R)
Epilobium densiflorum (Lindley) P. Hoch & Raven Dense-flowered
Spike-primrose (R)
Epilobium foliosum (T.& G.) Suksd. Leafy
Spike-primrose (R)
Epilobium glaberrinum Barbey ssp. glaberrinum Waxy
Willow-herb (R)
Epilobium pygmaeum (Speg.) P. Hoch & Raven Smooth
Spike-primrose (R)
Epilobium torreyi (S. Watson) P. Hoch & Raven Brook
Spike-primrose (R)
Epipactis gigantea
Hook. Stream Orchid (U)
Equisetum arvense L. Common or Field Horsetail (U)
Equisetum hyemale var. affine (Engelm.) Calder & R.L. Taylor Common or
Giant Scouring Rush (U)
Equisetum telmateia ssp. braunii (Milde) R.L. Hauke Giant Horsetail
(U)
Equisetum Xferrissii
Clute Ferris
Horsetail (R)
Eragrostis
mexicana (Hornem.) Link ssp. mexicana Mexican Lovegrass (R)
Eragrostis
mexicana var. virescens (C. Presl) Koch & E. Sanchez Orcutt Lovegrass (R)
Eragrostis
pectinacea (Michx.) Nees var. pectinacea Tufted
Lovegrass (R)
Eremalche parryi (E.
Greene) E. Greene ssp. parryi Parry Mallow (R)
Eriastrum densifolium
ssp. elongatum (Benth.) H. Mason Elongate
Woolly Star
Eriastrum densifolium ssp. mohavensis (Craig) H. Mason Mojave Woolly Star (R)
Eriastrum eremicum (Jeps.) H. Mason ssp. eremicum Woolly Star (R)
Eriastrum filifolium (Nutt.) Woot. & Standl. Narrowleaf Woolly
Star
(R)
Eriastrum hooveri (Jepson) H. Mason Hoover
Woolly Star (R) CNPS List 4
Eriastrum pluriflorum (A.A. Heller) H. Mason Woolly
Star
(R)
Eriastrum sapphirinum (Eastw.) H. Mason Saphire
Woolly Star (R)
Ericameria arborescens (A. Gray) E. Greene Golden-fleece (R)
Ericameria cooperi (Gray) H.M. Hall var. cooperi Cooper
Goldenbush (R)
Scientific Name Common
Name
Ericameria cuneata (Gray) McClatchie var. cuneata Wedgeleaf Goldenbush (U)
Ericameria cuneata var. spathulata (A. Gray) H.M. Hall Spatulate-leaved Goldenbush (R)
Ericameria
ericoides (Less.) Jeps. ssp. ericoides Heatherleaf
Goldenbush (R)
Ericameria palmeri var. pachylepis (H.M. Hall) Nesom Palmer Goldenbush (R)
Ericameria pinifolia (Gray) H.M. Hall Pine
Goldenbush (R)
Erigeron breweri var. covillei
(Greene) G. Neswom Fleabane
Daisy (R)
Erigeron
glaucus Ker-Gawler Seaside
Daisy (R)
Eriodictyon
californicum (Hooker & Arnott) Torrey California Yerba Santa (R)
Eriodictyon
crassifolium Bentham var. crassifolium Thickleaf Yerba Santa (R)
Eriodictyon traskiae Eastw. Trask
Yerba Santa (R)
Eriodictyon trichocalyx A.A. Heller var. trichocalyx Yerba
Santa
(R)
Eriogonum angulosum Benth. Angle-stemmed
Buckwheat (R)
Eriogonum arborescens Greene Arborescent
Buckwheat (U)
Eriogonum baileyi S. Watson var. baileyi Bailey
Buckwheat (U)
Eriogonum covilleanum Eastw. Coville
Buckwheat (R)
Eriogonum crocatum Davidson Conejo
or Saffron Buckwheat (R, Type)
Eriogonum deflexum var. baratum (Elmer) Reveal Flat-crown
Buckwheat (R, Type)
Eriogonum elegans Greene Elegant
Buckwheat (R)
Eriogonum gracillimum S. Watson Slender
Buckwheat (R)
Eriogonum grande Greene var.
grande Island
Buckwheat (U)
Eriogonum grande Greene var. rubescens
Munz Red
Island Buckwheat (U)
Eriogonum grande Greene var. timorum
Reveal San
Nicolas Island Buckwheat
(U)
Eriogonum heermannii Durand &
Hilg. var. heermanni Heerman
Buckwheat (U)
Eriogonum hirtiflorum
S. Watson Hairy-flowered
Buckwheat (R)
Eriogonum hooveri (Reveal) Reveal Hoover
Buckwheat (U)
Eriogonum inerme (S. Watson) Jeps. Unarmed
Buckwheat (R)
Eriogonum kennedyi ssp. alpigenum (Munz & Johnston) Munz &
Johnston Alpine Kennedy Buckwheat (R)
CNPS List 1B
Eriogonum kennedyi var. austromontanum Munz & I.M. Johnston Southern Mountain Buckwheat (R) CNPS List 1B
Eriogonum latifolium Smith Coast
Buckwheat, Tibinagua (R)
Eriogonum maculatum A.A. Heller Buckwheat (R)
Eriogonum molestum Greene Pine
Buckwheat (R)
Eriogonum nudum var. westonii (S. Stokes) J.T. Howell Weston Barestem
Buckwheat (U)
Eriogonum nudum var.
pubiflorum Benth. Hairy-flowered Barestem Buckwheat (U)
Eriogonum ordii S. Watson Ord
Buckwheat (R)
Eriogonum parvifolium var. paynei (Wolf ex Munz) Reveal Payne
Dune Buckwheat (U, Type)
Eriogonum roseum Durand & Hilg. Rose
Buckwheat (U)
Eriogonum saxatile S. Watson Rock
Buckwheat (U)
Eriogonum spergulinum ssp. reddingianum (Jones) J.T. Howell Spurry Buckwheat (R)
Eriogonum trichopes Torrey var. trichopes Little
Trumpet (R)
Eriogonum umbellatum var. furcosum Reveal Sulphur
Buckwheat (R)
Eriogonum umbellatum var. munzii Reveal Munz
Yellow Buckwheat (U)
Eriogonum umbellatum var. subaridum S. Stokes Sulphur
Buckwheat (R)
Eriogonum viridescens A. Heller Green
Buckwheat (R)
Eriogonum wrightii var. membranaceum Jeps. Sheathed
Wright Buckwheat (R)
Eriophyllum confertiflorum (DC.) A. Gray var. laxiflorum A. Gray Few-flowered Golden Yarrow (R)
Eriophyllum jepsonii Greene Jepson
Woolly Yarrow (R)
Eriophyllum staechadifolium Lagasca Seaside
Woolly Sunflower (U)
Eryngium vaseyi J. Coulter & Rose Coyote
Thistle or Button-celery (R)
Erysimum insulare Greene ssp. insulare Island
Wallflower (U)
Erysimum insulare ssp. suffrutescens (Abrams) R.A. Price Island Wallflower (R)
Eschscholzia caespitosa Bentham ssp. caespitosa Tufted
Poppy (U)
Eschscholzia hypecoides Bentham Gypsum
Poppy
(R)
Eschscholzia lemmonii Greene ssp. lemmonii Lemmon
Poppy
(R) CNPS List 4
Eschscholzia minutiflora S. Watson Tiny-flowered
Poppy
(R)
Eschscholzia ramosa (Greene) Greene Island
Poppy (R)
Euphorbia palmeri S. Watson var. palmeri Wood
Spurge
(R)
Scientific Name Common
Name
Fimbristylis thermalis S. Watson Hot-Springs
Fimbristylis (R)
Forestiera pubescens Nutt. Desert
Olive, Dwarf Swamp Privet (R)
Fraxinus velutina Torrey Velvet
or Arizona Ash (R)
Fritillaria agrestis E. Greene Stink
Bells
(R) CNPS List 4
Fritillaria biflora Lindley var. biflora Chocolate
Lily, Mission Bells (R)
Fritillaria ojaiensis A. Davidson Ojai
Fritillary (R, Type) CNPS List 1B
Fritillaria
pinetorum A. Davidson Pine
Fritillary (R)
Galium angustifolium ssp. foliosum (Hilend & Howell)
Dempster & Stebb. Channel
Islands Bedstraw (R, Type)
Galium bifolium S. Watson Low
Mountain Bedstraw (R)
Galium californicum Hooker & Arnott ssp. californicum California
Bedstraw (R)
Galium cliftonsmithii (Dempster) Dempster & Stebb. Santa
Barbara Bedstraw (R)
Galium nuttallii A. Gray ssp. nuttallii San
Diego or Climbing Bedstraw (U) CNPS List 4
Galium porrigens Dempster var.
porrigens Climbing
Bedstraw (U)
Galium trifidum var. pacificum Wiegand Coastal
Bedstraw (R)
Galium triflorum Michaux Sweet-scented
Bedstraw (R)
Gayophytum diffusum ssp. parviflorum H. Lewis & J. Szweykowski Diffuse Gayophytum (R)
Gayophytum heterozygum H. Lewis & J. Szweykowski Hybrid
Gayophytum (R)
Gayophytum racemosum T. & G. Black-foot
Gayophytum (R)
Geranium californicum G. Jones & F. Jones California
Geranium (R)
Geranium viscosissimum Fischer & C. Meyer Sticky
Cranesbill (R)
Gilia achilleifolia Benth. ssp. achilleifolia California
or Yarrow-leaved Gilia (U)
Gilia achilleifolia Benth. ssp. multicaulis (Benth.) V. & A. Grant Many-stemmed California Gilia (R)
Gilia angelensis V. Grant Los
Angeles Gilia (R)
Gilia australis (Mason & A. Grant) V. Grant & A. Grant Southern Gilia (R)
Gilia brecciarum M.E. Jones ssp. brecciarum Breccia
Gilia
(R)
Gilia brecciarum ssp. jacens (A. Grant & V. Grant) Day Purple-flowered
Breccia Gilia (R)
Gilia capillaris Kellogg Miniature
or Smooth-leaved Gilia (R)
Gilia clivorum (Jeps.) V. Grant Island
Gilia (R)
Gilia interior
(Mason & A. Grant) A. Grant Slender-flowered
Gilia
(R)
Gilia latiflora ssp. cuyamensis A. & V. Grant Cuyama Gilia (R) CNPS List 4
Gilia latiflora ssp. davyi (Milliken) A. & V. Grant Davy
Broad-flowered Gilia (R)
Gilia leptantha ssp.
pinetorum A. & V. Grant Gabriel
Trumpet (U) CNPS List 4
Gilia nevinii Gray Nevin
Gilia (U)
Gilia sinuata Benth. Sinuate
Gilia
(R)
Gilia splendens H. Mason & A. Grant ssp. splendens Splendid
Gilia (U)
Gilia tetrabreccia A. & V. Grant Mount
Piños Gilia (R)
Gilia transmontana (H. Mason
& A. Grant) A. & V. Grant Desert
Gilia (R)
Githopsis diffusa A. Gray ssp. diffusa Southern
Bluecup (R)
Grindelia camporum var. bracteosum (J.T. Howell) M.A. Lane Bracted
Gumplant (U)
Grindelia camporum E. Greene var. camporum Great
Valley Gumplant (R)
Grindelia hirsutula Hook. & Arn. var. hirsutula Hirsute
Gumplant (R, Type)
Grindelia stricta var. platyphylla (Greene) M.A. Lane Island Gumplant (R)
Grindelia Xlatifolia Kellogg ssp. latifolia Coastal
Gumplant (R)
Guillenia
lasiophylla (Hook. & Arn.) Greene California
Mustard (R)
Guillenia lemmonii (Greene) R. Buck Lemmon
Mustard (R)
Gutierrezia sarothrae (Pursh) Britton & Rusby Broom
Snakeweed, Matchweed (R)
Hazardia detonsa (Greene) Greene Island
Goldenbush (R)
Hazardia squarrosa (Hooker & Arnold) E. Greene var. squarrosa Sawtooth Goldenbush (R)
Helenium bigelovii Gray Bigelow
Sneezeweed (U)
Helenium puberulum DC. Rosilla (R)
Helianthemum scoparium Nutt. Peak
Rushrose (R)
Helianthus gracilentus Gray Wild
Mountain or Slender Sunflower (R)
Hemizonella minima
(Gray) Gray Mini
Tarplant (U)
Hesperevax sparsiflora (A. Gray) E. Greene var. sparsiflora Few-leaved Evax (R)
Hesperochiron californicus (Benth.) S. Watson California
Hesperochiron (R)
Hesperochiron pumilus (Griseb.) Porter Hesperochiron (R)
Scientific Name Common
Name
Hesperocnide tenella Torrey Western
Nettle
(R)
Heterotheca psammophila B. Wagenkn. Camphor
Weed
(R)
Heterotheca
sessiliflora (Nutt.) Shinners
ssp. sessiliflora Hairy Golden-Aster (R)
Heterotheca sessiliflora ssp. camphorata (Eastw.) Semple Camphor Golden-Aster (R)
Heterotheca sessiliflora ssp. echioides (Benth.) Semple Hairy Golden-Aster (U)
Heterotheca sessiliflora ssp. fastigiata (Greene) Semple Hairy Golden-Aster (R)
Heuchera abramsii Rydb. Abrams
Alumroot (R)
Heuchera cespitosa Eastw. Alumroot (R)
Heuchera elegans Abrams Urn-flowered
Alumroot (R)
Heuchera maxima Greene Island
Alumroot (R)
Hieracium albiflorum Hooker White-flowered
Hawkweed (R)
Hieracium argutum Nuttall Southern
California Hawkweed (R)
Hieracium horridum Fries Shaggy
or Woolly Hawkweed (R)
Hoffmannseggia glauca (Ortega) Eifert Pig-nut,
Hog Potato (R)
Hoita orbicularis (Lindley) Rydb. Round-leaved
Hoita
(R)
Hollisteria lanata S. Watson Hollisteria (R)
Holocarpha heermannii (E. Greene) Keck Heermann
Tarplant (R)
Holodiscus discolor (Pursh) Maxim. Oceanspray,
Cream Bush (R)
Holodiscus microphyllus Rydb. var. macrophyllus Rock
Spiraea (R)
Hordeum brachyantherum Nevski ssp. brachyantherum Meadow
Barley
(R)
Hordeum brachyantherum ssp. californicum (Covas & Stebb.) v. Bothner et al. California Barley (R)
Hordeum depressum (Scribner & J.G. Smith) Rydb. Low
Barley
(R)
Hordeum intercedens Nevski Vernal
Barley (R)
Horkelia cuneata Lindley ssp. cuneata
Wedgeleaf
Horkelia (R)
Horkelia cuneata ssp. puberula
(Greene) Keck Fuzzy
Horkelia (R)
Horkelia rydbergii Elmer Rydberg
Horkelia (R)
Hulsea heterochroma Gray Red-rayed
Hulsea
(R)
Hulsea vestita ssp. gabrielensis Wilken San
Gabriel Hulsea (R)
Hutchinsia procumbens (L.) Desv. Desert
Hutchinsia (R)
Hydrocotyle verticilata Thunb. Marsh
Pennywort (R)
Hypericum formosum var. scouleri (Hook.) J. Coulter St. John’s Wort (R)
Imperata brevifolia Vasey Satintail (R)
Iris missouriensis Nuttall Western
Blue Flag [Iris] (R)
Isocoma acradenia (E. Greene) E. Greene Desert
Goldenbush (R)
Isocoma menziesii (Hook.
& Arn.) G. Nesom var. menziesii Coastal
Goldenbush (R)
Isolepis cernua (Vahl) Roemer & Schultes var. cernua Low Clubrush (R)
Isocoma menziesii var.
sedoides (E. Greene) G. Nesom Coastal Goldenbush (R)